<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>用户登录</title>
  <style>
    body {
      background-color: #f7f7f7;
      font-family: Arial, sans-serif;
    }

    h1 {
      text-align: center;
      color: #333333;
      padding-top: 50px;
    }

    form {
      width: 300px;
      margin: 0 auto;
      padding: 20px;
      background-color: #ffffff;
      border: 1px solid #e0e0e0;
      border-radius: 4px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    table {
      margin: 0 auto;
      border-collapse: collapse;
    }

    td {
      padding: 10px;
      color: #333333;
    }

    input[type="text"],
    input[type="password"] {
      width: 100%;
      padding: 10px;
      border: 1px solid #e0e0e0;
      border-radius: 4px;
      font-size: 14px;
    }

    input[type="submit"] {
      width: 100%;
      padding: 10px;
      background-color: #428bca;
      border: none;
      border-radius: 4px;
      color: #ffffff;
      font-size: 14px;
      cursor: pointer;
    }
  </style>
</head>
<body>
<h1>用户登录</h1>
<form action="/loginUser" method="get">
  <table>
    <tr>
      <td>用户名</td>
      <td><input name="username" type="text"></td>
    </tr>
    <tr>
      <td>密码</td>
      <td><input name="password" type="password"></td>
    </tr>
    <tr>
      <td colspan="2" align="center">
        <input type="submit" value="登录">
      </td>
    </tr>
  </table>
</form>
</body>
</html>